package com.hx.base.others;

import java.util.HashMap;
import java.util.Map;

/**
 * @author jxlgcmh
 * @data 2019-11-02 17:57
 */
public class HashMapTest02 {
    public static void main(String[] args) {
        Map map = new HashMap();
        map.put(null, null);
        Object o = map.get(null);
        System.out.println(o);
    }
}
